This word first appeared several decades ago, in the brilliant comedy film Monty Python's Quest For The Holy Grail, from the Monty Python team. It is said by the leader of the...knights-who-all-too-recently-said-ni when he tells Arthur they're no lnoger the knights who say ni.

I froget the exact word, but he says "we now the knights who say <something>woopetang<some more nonsesne, trailing off into just a nosie>"